Valve



Sept. 13, 1932. (3. A, NRGREN VALVE Filed April 16. 1928 TT ORNEY INVENTOR.

Patented Sept. 13, 1932 CARL A. NORGREN, or DENVER, oorlonano Y l vALvE Application filed April 16,

, This invention relates to improvements in air guns 'ofthe type disclosed in my application for patent Serial No. 178,653, liled March 26, 1927,r of which 'the presentappli'- cation is'a continuation as to features com.-

monto both applications.

The i `vention hereinafter to be described in detail relates particularly to the constructionvof the valve by which theadmission of air "under pressure,'used in the operation of the gun, is controlled at the will of the op'- erator. f It is an object of the inventionto provide a valve of this type which is simple incon- 15 struction, practical and eiiicientin operation. f Another object of the present invention is to provide a valve assembly that may be inserted as a unit in any device using fluid pressure. Y

:A further object is to provide means in' such a valve to prevent leakage while in use and when not in use.

Stillother objects reside in details of construction and in novel combinations and arrangements of parts. In the drawing, in which, like reference characters represent similar parts in the two views, Figure 1 is a sectional elevation of an air gun of which the presentvalve is an element, Figure 2 is a sectional elevation of the valve., drawn to anenlarged scale; and

Figure 3 isa broken, sectional elevation,

showing another position of the valve, drawn to the same scale as Figure 2.

Referring more particularly to the draw ing, the reference numeral 5 represents the body of a gun, in which the present valve is used as will be more fully explained hereinaft'er.` p'

`.The bodv 5has a threaded valve chamber Y 6 connected by a duct 7 with a screw-threaded Y socket 8 at an end of the body; A conduit 9, connected with a suitable source of air supply. is fastened to the body by a coupling 10 havingr anipple 12 in the screw-threaded socket.

An axial bore'13, at the oppositeend of the body, Vlikewise' connects with thel valve chamber 6. A' passage 14 in' the body, transverse 17 A tube` 18, extending interior to the bore 13. The valve proper conv.sists of a flat disc 29 on an end of a yvalveIV stem SOgmounted to slide inthe cage 27. The

ly larger inl diameter than the cage bore and 192s. serial No. 270,359.

to the' bore, is screw-threaded for` the appli-V cation of a `shorttube .15 thatconnects the bore 26 with apassage 16 in an oil reservoir diagonally through the reservoir, feeds oil from: the reservoir to the passage 16.`

The reservoirhas a `filler opening 19 and an internal boss 20'surrounding samel The bore of the body has screwfthreaded shoulders 21 and 22 of 'different diameters. Co-aXial, spaced pipes 23 and 24: are screwed into saidshoulders respectively. The inner pipe 24' connectsthe bore lvwith a nozzle at an end of the pipes and the space between the pipes is connectedfwith the tube 15 vby an enlarged portion 26 of the bore.

The nozzle consists ofan apertured cap`25 screwed on the end of the outer pipe 23 around a jet tip 26 screwed on thel inner f pipe 24:.k The cap :25 is normally spaced Y70 from the tip to provide' a passage for the discharge of the oil, but it can be screwed into engagement with the tip to seal the Vdevice when'not in use. .I

. Mounted in the chamber 6 is a valve which 75 controls the passage of air from the conduit 9 to the inner pipe 24. v 7 f v i The valve has a threaded cage 27 screwed into the valve chamber'into engagement with a washer or gasket'? of soft material placed against a shoulderA at the inner yend of the chamber to provide'a resilient-valve seat..

The case has ports 28 and a circumferential groove 39 for the passage offair from its end of the' stem opposite to th at which carries the disc, prot-rudes from the cage and has a screw-threaded connection' 31`witha head 0 or button 1 The valve stem is peripherally grooved-as at 38, to provide a space for a flexible Vsealing washer or diaphragm 34;. which is slightcontactswith the wall thereof to prevent air from leaking past 'the valve stem when the button is depressed to separate the vvalve from its seat. The grooved portionof the' stem 30 isfmovable throughftlie washerl, as indicated by the relative positions of the groove and washer in Figures 2 and 8. Figure 2 shows the valve in a closed position, and Figure 3 shows same in an open position. The stem also has a tapered shoulder 38 adjacent the groove 33, which assists in maintaining` the sealing washer inthe cup shape shown insthe drawing lhestem is;=.also peripherally grooved as at to provide a passage between the duct 7 andtheports 28.

A hole 36 in the stem'immediately below the button is for the insertion of an awl or.

other pointed tool, to hold the stem while the button is screwed upon-its extremity.

In assembling the valve, the resilient washer is stretched and ,pulled Voverthe end 3l of the valve stem funtil cit 'reaches the groove 33, when it contracts to the-sizesh'own. VThe stemis vthen insertedthrough .the cage bore from-the bottom, .as shown in 'Figure 2, until the disc 29 engages lthe gasket 37 1., An awl or -rother instrumentV is. thenxinserted in the hole 361=to hold the valvelstem 30 against rotation. 'The'button 327isthen screwed on the threadedfend 3l. The Avalvezunit is" now ready for application to` asprayagumwan air. line, Vorfother device. Y

l,Inathe operation ofthe gun,the.fluid pressureiinthe duct 7 keeps v.the disc"29'tight againstthe gasket B7. `The sealing washer being larger thany the bore,the7shoulder 38 holds `same inra :cup shape. Y

When thevbutton'is depressedfthe valve stem causes the sealing washer to press tightly against the wall of the cagebore, thereby sealing the latter. against .the escapeV` of'fair around the valve stem. A Y Y the button is'released,'the {iu-id pressure from the duct and resilience ofthe sealingl washer lcause the valve toy seat firmlyV against the; gasket 37.

In operating the gun shown in the drawing, the vreservoir is -iilled with oil poured through theN opening 19,V whichfis closed by 'a cap 140. The body is 'connected byA the bore l8 with a source of: airgpressure. f f ,e

Byy vdepressing:the'button 82, fas explained, the-air pressure passingfrom thejet 26 createsa parti al lvacuum inside the cap .25, which v drawsliquid from the reservoir through the passage 16, tube 15 andthe outer` pipe 23. An fatomizing eli'ect is produced fat the nozzle to deliver the oil from' thel nozzle in aspray.

The discharge at the nozzle is :regulated'by the position ofthe `cap 25frelative to the air j et. When the gun is not in usefthe' oil outlet maybe `sealed by screwing the cap/tight on vthe jet.

The valve of the` present Yinvention is not limited in its use to a spray gun of the char'- 'acter' described, but may be used in any-air line orfor the'control of ,other fluidl pressure. WVha-t I claim and desire to see-ure 'by-Letters Patent is:

` 1. In an. airgline, air-controlling valve comprising incombination with a body having a valve chamber and a duct orthe ingress of air to the chamber and a duct for the egress of air from the chamber, a valvecage in the body having a port in connection with the egress-duct, a valve controlling the admission oi-air romthe Vingress-duct -to the valvel-cage,`.a shouldered stem rforthevalve movable in the cage and projecting outside the same for its manipulation, and a resilient fwa'sherin'thecage for engaging a shoulder onrthe stem.

'2. In an air line, an air-controlling valve comprising incombination with a body having afvalve chamber and a duct for the ingress ofIair tothe chamber andiaduct'lfor theegress of air-from thechamber,-a-'valve-` cage 1n the bodyhaving a port 1n connection with the egress-duct, a valve controlling the admission ,of air from the ingress-duct to the valve-cage, a resilient 'seat for the'valve, a shouldered stem for the-valve movable in the cage and projecting outside the same for its .inanipulatiom anda resilient washer inthe cage for engaging a shoulder' on the-stem.

3. In an air line, Van air-controllingvalve comprising in combination with a body Ahaving'a valve chamber -anjd a ductforthe; ingress fof air to the 'chamber and a duct'for theegress of air from-theA chamber, a valvecage in the body Ahaving a port in connection with theegress-ductpa valve controlling the admission ofair from the ingress-duettothe valve-cage, a stem for the valve slidablyltitted-'in the cage and' projecting outside the same fori its manipulation, the stem having-a peripheral groove, anda resilient washer in thegrooveyin engagement with the wallof the cage. f

4. .In an air line, an .air-controllingV valve comprising in combina-tion with a body having a valve chamber anda duct'for the ingress oair to the chamber and a duct for the-egress of air from thechamber, a valve-cage in the body having 'a port in connection with/the ies egress-duct, a valve controlling the admission of air fromthe ingress-duct tothe valve-cage, a shouldered stem forthe'valve movable'in the cage and projecting outside'the same-for its manipulation, and a resilient overlsize washer-in the cage for engaging` a shoulder on theV stem.

` 5. In an airY line, an air-controlling valve comprising in combination witha' body having a valve chamber and a duct for the ingress of air to theohamber and a duct for-the egress of' air from the chamber, a'valve-'cage in the body having a port in connection with 'the egress-duct, a valve controlling the AVadmission of -a-ir from the ingress duct to the valvecage, a shouldered stemor'thevalve movable in the cage and projecting outside the ysame for itsmanipul'atiom'and `awasher of larger ldiameter'than the interior of the caga-forengaging a shoulder of the stem within the cage'.

CTI

6. In an air line, an air-controlling valve comprising in combination with a body vhaving a valve chamber and a duet for the ingress of air to the ehamber and a duct for the egress of air from the chamber, a valve-Cage in the body having a port in conneetionwith the egress-duct, a valve controlling the admission of air from the ingress-duct to the.

valve-cage, a stem on the valve slidably fitted in the cage and nroJeeting outside the same for its manipulation, the stem having peripheral grooves, one of which is in register with the port of the cage, and a resilient Washer in the other groove of the stem.

7. In an air line, a valve chamber and a valve controlling the passage of air through the line, the valve comprising a shouldered stem and a cup-shaped flexible diaphragm on.

the stem, engaging the Wall of the chamber, the stem being movable through the diaphragm, and the shoulder being disposed to move'the diaphragm toa position for tightly i engaging the VWall of said chamber to seal the chamber against leakage during such movement of the stem.

8. In an air line,l a valve Chamber, a valve seat and a manually operable valve, disposed to be held against the seat, comprising la stem, a normally cup-shaped, flexible diaphragm on the stem, engaging the Wall of the chamber the stem being movable through the diaphragm7 and means Vfor moving the diaphragm tight against the Wall to seal the chamber against leakage of air when the stem is moved to open the valve.

In testimony whereof I have aiixed my signature. l Y Y CARL A. NORGREN. 

